Pulley-block



(No Model.)

F. D. GOSNELL& J. E. THOMAS.

PULLEY BLOCK.

No. 598,776. Patented Feb. 8,1898.

FRANK D. GOSNELL AND JAMES E. THOMAS, OF TERRE HAUTE, INDIANA.

PULLEY-BLOCK.

SPECIFICATION formingpart of Letters Patent No. 598,776, dated February8, 1898.

Application filed June 29, 1897.

To ctZZ whom it may concern:

Be it known that we, FRANK D. GosNELL and JAMES E. THOMAS, of TerreI-Iaute, in the county of Vigo and State of Indiana, have inventedcertain new and useful Improvements in Pulley-Blocks; and we do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use it, reference being had to the accompanyingdrawings, which form part of this specification.

This invention relates to pulley-blocks; and the object thereof is toprovide the block with an improved lock adapted to be operated by thehoisting-rope for securing the latter, with its load, at the desiredelevation.

The invention consists in the novel features of construction and in thecombination and arrangement of parts hereinafter fully described andclaimed, and illustrated by the accompanying drawings, in which- Figure1 is a perspective view of the block. Fig. 2 is an elevation of thesame, one side of the block-casing being removed, with thelocking-dogoutof operation. Fig. 3isasimilar view, the rope being lockedby the dog. Fig. 4 is a detail view of the dog.

The block-casingA and suspension-hook B are preferably,though notnecessarily, formed of a single casting. The upper portion 0 of thecasing is of circular form and closed at its upper side to incase anordinary grooved pulley D. Depending from one side of this circularportion is the channeled portion E, which terminates in the ears F,extending horizontally beneath pulley D, and at their outer ends formedwith apertures to receive pin G, upon which locking-dog H is pivoted.The latter is curved slightly with its convex edge uppermost, and at itslower and'outer end carries eye I-I, through which the free portion ofhoisting-rope I extends, andat its inner end carries the curvedperipherallygrooved jaw J. This jaw is formed with the central deepgroove J in the bottom of the curved edge, and on opposite sides of thisdeep groove and in said curved edge are serrations K. The active orhoisting portion of the rope extends upward between said jaw and theback of channeled portion E, and when the object being lifted is at thedesired Serial No. 642,855. (No model.)

' elevation the free or slaok side of the rope is drawn laterally awayfrom the hoisting portion, thus raising the lower end of the locking-dogand throwing its inner or jaw end against the rope and forcing thelatter against the back of channeled portion E, and owing to theparticular form of jaw here shown and described the same takes securehold upon the rope, and when the elevating means is released and thewhole weight of the lifted article brought upon the dog the grip of thejaw will be rendered even more secure, as its action is in the nature ofa clutch with its gripping or holding strength dependent somewhat on theweight of the article being ele vated.

The pulley-block is designed with particular reference to use inhoisting bicycles, as in moving same from one floor to another of abuilding, or when suspending same when making repairs, and for this usewe provide for the rope end the double-ended hook O, the hooks beingpreferably covered with rubbcr P to prevent scratching, while the back Qis formed with offset R where the rope is attached to keep the latter incentral position. It will be understood, however, that its use is notlimited, as it may be employed in any connection where a rope-lock is required, or even where a lock is not required, as the normal position ofthe free side of the rope is such as to hold the dog from engagementwith the active portion.

Having thus fully described our invention,

what we claim, and desire to secure by Letters Patent, is

1. An improved pulley-block comprising a casing having a dependingextension adapted to form a rope-bearing surface, a pulley within thecasing, a dog pivoted between its ends adjacent the pulley and one endadapted to clamp the active side of the rope against the casingextension, the active end and the free end of the dog being out of linewith the pivotal point so that the said free end may depend in verticalline with one side of the pulley when the dog is inactive, the said freeend of the dog being loosely connected to the inactive side of the rope,whereby when said inactive side of the rope is given a straight downwardpull it will pass free of the dog,

but when given a lateral movement it will ,turn the dog to a lockedposition, substantially as shown and described.

2. An improved pulley-block, comprising a casing having a downwardextension forming a rope-bearing surface, a pulley in the upper portionof the casing, a dog pivoted between its ends beneath and in line withthe pulley and at one end adapted to clamp the hoisting side of the ropeto the bearing-surface of the 10 casing, and the opposite end of the dogformed with an eye adapted to embrace the inactive side of the rope, thedog being operated by laterally swinging the rope, substantially asshown and described.

3. An improved pulley-block, comprising a casing having a dependingchanneled extension through which the hoisting side of the rope passes,said extension terminating in the ears F extendinghorizontally beneaththe casing-body, a dog pivoted to swing vertically between said ears andat one end adapt-v ed to clamp the rope in the channeled extension ofthe casing, and at its opposite end formed with an eye adapted toembrace the inactive side of the rope, and a pulley journaled in theupper portion of the casing, substantially as shown and described.

In testimony whereof we affiX our signatures in presence of twowitnesses.

FRANK D. GOSNELL. JAMES E. THOMAS. Witnesses: V

OHAs. D. FLAID,

JOHN THACKER.

